RU132810U1 - PILED FOUNDATION WITH INTERMEDIATE SAND PILLOW - Google Patents

Abstract

A pile foundation with an intermediate sand cushion, characterized in that the sand cushion is laid on a flat film membrane, the joints of which are glued with the corresponding adhesive composition, while the joints of the pile - flat film membrane are also glued to prevent moisture from entering, and to prevent soaking of the sand cushion from the side surface , the edges of the flat film membrane are thrown over the sand pillow itself with approach under the base of the foundation from all sides.

Description

The utility model relates to the field of construction, namely to pile foundations and can be used in the construction of pile foundations in the construction of buildings and structures in areas with seismic activity.

The construction of a pile foundation is known (Foundations, foundations and underground structures. M., 1985. Fig. 8.14), consisting of a group of piles, a monolithic reinforced concrete grillage, rigidly connected to the heads of piles located above the grillage of a part of the foundation (sub-column - in the case of a freestanding foundation or wall of the strip foundation), to which the load from the building is transferred. Such a foundation design has the following disadvantages. Horizontal seismic impact from the surrounding soil is transmitted to piles, a monolithic grillage, and the underground part of the foundation, which oscillates during the passage of seismic waves and receives residual seismic displacements. Piles with low mass could potentially oscillate and move with the ground. But due to the rigid connection with the grillage and the entire mass of the building, which has tremendous inertia, shear forces arise in them.

The closest in technical essence to the claimed construction of the foundation is a pile foundation with an intermediate cushion selected as a prototype (Foundations, foundations and underground structures. M., 1985. P.12.3 .; Ilichev VA, Mongolov Yu.V., Shaevich V.M. Piled foundations in seismic regions. M., 1983). It consists of piles with heads, an intermediate cushion of bulk materials (crushed stone, gravel, sand of large and medium size) with a thickness of 40 ... 60 cm above the heads, compacted to the maximum possible density. A monolithic grillage rests on an intermediate cushion, above which in the strip foundation are the foundation walls, and in a separate foundation - a glass-type column, which forms a whole with the grill plate.

The main disadvantages of this device is the decrease in sanding ability during dynamic impacts in flooded areas.

The technical result is to simplify the design and operation of buildings in areas with high seismic activity, as well as in areas subject to any dynamic effects on the ground. On construction sites at the base of foundations, where swellable soils stand.

The technical result is achieved by the fact that the sand cushion (bulk materials) arranged in the interval between the pile and the base of the foundation is laid in a flat film membrane. Flat film membrane (PPM) is made of high density polyethylene (HDPE) or polyvinyl chloride (PVC). Such a membrane has the form of a film 2 mm thick., Which then completely covers the sand cushion. Sand cushion, can be formed in two ways: 1) before pile driving, i.e. the pile cuts through the sand cushion and the sand cushion is compacted to a predetermined density level and subsequently no breakdown of the pile head is required; 2) after driving the piles by tamping, the intermediate bulk layer is compacted to a predetermined state.

Laying a flat film membrane should be done before driving piles. Material 1 (PPM) is laid immediately on the ground, the joints of which are glued with an adhesive suitable for the given flat film membrane, then piles 2 are clogged, cutting through the material itself, after immersion, the joints of the PPM pile are glued to prevent moisture from entering .. The next step is to fill the sand 3 and compaction to the desired density. To exclude the soaking of the sand cushion from the lateral surface, the edges of the flat film membrane 1 are thrown onto the sand cushion itself, approaching under the foundation 4, at least 0.55 V from all sides, where B is the width of the grillage on each side. Under the sand cushion in the ground there are deepened passageways or semi-passageways for laying communications that do not have strength ties with the grillage, flexible inserts are introduced in the joints between communications pipes and entrances to the building, the building does not interfere with possible small mutual displacements.

The drawing is attached figure 1

Distinctive features of the prototype are:

- the absence of heads on piles, reduces material consumption and labor costs

- sand cushion laid in a flat film membrane (PPM)

- in the junction between the communication pipes and the inputs to the structure, the building introduced flexible inserts

- a pile foundation with an intermediate sand cushion laid in a flat film membrane is acceptable for seismic regions with difficult hydrogeological conditions

- under the sand cushion in the ground are deepened passageways or semi-passageways for laying communications that do not have strength ties with the grillage

Claims (1)

A pile foundation with an intermediate sand cushion, characterized in that the sand cushion is laid on a flat film membrane, the joints of which are glued with the corresponding adhesive composition, while the joints of the pile - flat film membrane are also glued to prevent moisture from entering, and to prevent soaking of the sand cushion from the side surface , the edges of the flat film membrane are thrown over the sand pillow itself with approach under the base of the foundation from all sides.

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